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Composite Car Rear Spoiler

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Composite Car Rear Spoiler Composite Car Rear Spoiler Sandy Minkah Kyei Degree Thesis Plastics Technology 2014 DEGREE THESIS Arcada Degree Plastics Technology Programme: Identification number: Author: Sandy Minkah Kyei Title: Composite Car Rear Spoiler Supervisor Rene Hermann (Arcada): Commissioned by: This thesis study was conducted using NASTRAN Software to perform a static load analysis over a Solidworks designed composite rear spoiler with a chord length of 1400 mm. Product design methods were incorporated in the manufacturing process of the fiberglass rear spoiler with vacuum infusion lamination of a female and male mould encapsulated with a honeycomb core. The sandwiched material provided the product with very low weight, high stiffness and durability. Based on the properties of standard air, an assumption of a wind speed of 150 km/h, with an angle of attack of 8°, Reynolds number of 6.7*105 and a downforce of 829.614 N were calculated. A downforce of 829.614 N was used in the static load simulation and presented graphically as downforce and stress effect. Finally, the fiberglass laminate thickness was calculated to be 0.51 mm. Keywords: Aerodynamics, Downforce, Drag, Laminar &Turbulent flow, Spoiler, Simulation, Stress Analysis, Lamination. Number of pages: Language: English Date of acceptance: ACKNOWLEDGEMENT I would like to thank Almighty God for His Grace for steadfastly guiding me to achieve my academic goal. I would also like to thank Mr. Rene Hermann my supervisor for his direction and insight. A heart of gratitude goes to the staff and lecturers of Arcada UAS especially to the Energy and Material Technology department for their readiness to impact knowledge to the students. Finally, a warmth salutation goes to my family for their endless love and support, I gladly say in my heart, is where I will keep all of you as a secret. Symbols A = Reference Area (mm2) Cd = Co-efficient Drag Cr = Span of the spoiler (mm) Ct= Distance from the root to tip (mm) D= Permeability of the fabric stack Df = Downforce (N) η = Viscosity of resin system (Pa.s) ηɵ = Reinforcing Efficiency υ = Velocity of wind (m/s) δ = Stress (Pa) Ec = Young Modulus of Composite (Pa) Ef = Young Modulus of fiberglass (Pa) Em= Young Modulus of matrix (Pa) Fd = Drag (N) G = Shear Modulus (Pa) I = Moment of inertia (mm4) L = Chord length (mm) 흙P = Pressure difference (Pa) Re = Reynolds Number Tg = Transition Temperature (°C) tf = fiber thickness (mm) tc = Core thickness (mm) Contents 1. INTRODUCTION ................................................................................................... 9 1.1 Introduction to Rear Spoiler ................................................................................................ 9 1.2 Background ......................................................................................................................... 9 1.3 Automated Spoiler ............................................................................................................. 12 1.4 Objectives.......................................................................................................................... 16 2. METHOD ............................................................................................................. 17 2.1 Process Review for Rear Car Spoiler .................................................................... 17 2.2 Cost Estimation ................................................................................................................. 17 2.3 Raw Materials for Composite Manufacturing Processes .................................................. 18 2.4 Reinforcements ................................................................................................................. 19 2.5 Polymer Matrix Selection ................................................................................................... 20 2.6 Matrix Materials ................................................................................................................. 21 2.7 Epoxy ................................................................................................................................. 21 2.8 Polyesters .......................................................................................................................... 23 2.9 Vinyl esters ........................................................................................................................ 25 3. MANUFACTURING PROCESSES ............................................................................... 27 3.1 Hand lay-up Molding ......................................................................................................... 27 3.1.2 Method of Applying Heat and Pressure ......................................................................... 28 3.1.3 Basic Processing Steps .................................................................................................. 28 3.1.4 Merits of Hand Lay-Up Process ..................................................................................... 29 3.1.5 Limitations of Hand Lay-Up Process .............................................................................. 29 3.2 Spray-Up Process ............................................................................................................. 29 3.2.1 Making of the Part .......................................................................................................... 30 3.2.2 Basic Processing Steps .................................................................................................. 30 3.2.3 Merits of Spray lay–Up Process ..................................................................................... 31 3.2.4 Limitations of Spray lay-Up Process .............................................................................. 31 4. THEORY OF SPOILER .......................................................................................................... 32 4.1 History of Spoilers ............................................................................................................. 32 4.2 Design of a Rear Spoiler/Wing .......................................................................................... 33 4.3 The Airfoil Selection Process ............................................................................................ 34 4.4 Drag ................................................................................................................................... 38 4.5 Downforce ......................................................................................................................... 41 4.6 Flows: Laminar and Turbulent ........................................................................................... 42 4.7 Reynolds Number .............................................................................................................. 43 4.8 Mach Number (M) ............................................................................................................. 44 5. PRODUCT REVIEW .......................................................................................................... 46 5.1 Analyzing the Product Development Process ............................................................... 46 5.1.2 Conceptual Design Phase .............................................................................................. 46 5.1.3 Detailed Design .............................................................................................................. 47 5.2 Design Evaluation Method ................................................................................................ 48 5.3 Testing ............................................................................................................................... 49 6. RESULTS ............................................................................................................ 50 6.1 COMPOSITE REAR SPOILER .................................................................................. 50 6.2 Fiberglass .......................................................................................................................... 50 6.3 Designed Spoiler ............................................................................................................... 52 6.4 The Manufacturing Process .............................................................................................. 55 6.4.1 Laminate Preparation ..................................................................................................... 56 6.4.2 Resin Preparation ........................................................................................................... 57 6.4.3 Lamination Process ........................................................................................................ 58 6.5 Downforce of the Rear Spoiler .......................................................................................... 58 6.6 Simulation and Analysis .................................................................................................... 63 6.7 Finite Element Analysis (FEA)-Nastran ............................................................................. 64 6.8 Determination of Laminate Thickness. .............................................................................. 69 6.9 Estimated Cost Breakdown ............................................................................................... 71 7. Discussion............................................................................................................
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